Transcript Lab 20
Lab 20 Muscles of the shoulders, arm, and hand
Quiz for next week • Tuesday or
Thursday?
• Same format as today • Know Upper Arm, Lower Arm
,
Hip and Thigh, Upper Leg and Lower Leg
Muscles to know • • •
supraspinatus infraspinatus subscapularis
• •
teres major rhomboid
• •
levator scapulae deltoid
• biceps brachii • brachialis • triceps brachii • flexor carpi radialis • flexor carpi ulnaris • flexor digitorum sup.
• extensor carpi ulnaris • extensor digitorum • extensor carpi radialis • brachioradialis
Cut activity 4 • Only hand muscles you need to know are not explicitly mentioned in the lab (but they do appear in the pictures): – flexor pollicus longus – extensor pollicis longus
Muscles that Move the Arm Figure 11–15a
Muscles that Move the Arm Figure 11–15b
Muscles that Move the Arm (1 of 3) • Deltoid : – the major abductor • Supraspinatus : – assists deltoid • Subscapularis and teres major : – produce medial rotation at shoulder
Muscles that Move the Arm (2 of 3) • Infraspinatus : – produce lateral rotation at shoulder
Muscles that Move the Arm (3 of 3) • Pectoralis major : – between anterior chest and greater tubercle of humerus – produces flexion at shoulder joint • Latissimus dorsi : – between thoracic vertebrae and humerus – produces extension at shoulder joint
The Rotator Cuff • Muscles involved in shoulder rotation – supraspinatus, subscapularis, infraspinatus, teres minor ,and their tendons
Summary: Muscles that Move the Arm Table 11–12
Muscles that Position the Pectoral Girdle • Rhomboid and levator scapulae : – deep to trapezius – attach to cervical and thoracic vertebrae – insert on scapular border
Muscles that Move the Forearm and Hand • Originate on humerus and insert on forearm • Exceptions: – the major flexor ( biceps brachii ) – the major extensor ( triceps brachii )
Extensors and Flexors • Extensors: – mainly on posterior and lateral surfaces of arm • Flexors: – mainly on anterior and medial surfaces
Muscles that Move the Forearm and Hand • Biceps brachii : – flexes elbow – stabilizes shoulder joint –
originates
on scapula and humerus –
inserts
on radial tuberosity
Muscles that Move the Forearm and Hand • Triceps brachii : – extends elbow –
originates
on scapula (three spots) –
inserts
on olecranon • Brachialis and brachioradialis : – assist in flexing elbow (synergists)
Muscles that Move the Forearm and Hand -Extensors Figure 11–16a
Muscles that Move the Forearm and Hand - Flexors Figure 11–16b
Muscles that Move the Forearm and Hand • Flexor carpi ulnaris : – superficial – flexes wrist –
ad
ducts wrist
Muscles that Move the Forearm and Hand • Flexor carpi radialis : – superficial – flexes wrist –
ab
ducts wrist
Muscles that Move the Forearm and Hand • Extensor carpi radialis : – superficial – extends wrist –
ab
ducts wrist
Muscles that Move the Forearm and Hand • Extensor carpi ulnaris : – superficial – extends wrist –
ad
ducts wrist
Figure 11–16a
Figure 11–16b
Summary: Muscles that Move the Forearm and Hand Table 11–13 (1 of 2)
Today • Work through lab 20 • Relevant parts of lab reports due Next Week